[ git ] error: unable to read askpass response from '/usr/libexec/openssh/gnome-ssh-askpass'

This is common error generated after running the the command :

"$ git push -u origin master" 

This error can be technically ignored because git will still work; though this error is displayed.

If you don't like to see this error you can run unset SSH_ASKPASS and gnome-ssh-askpass will not be invoked and no error message will show up.

http://blog.csdn.net/lvzhuyiyi4/article/details/19564519